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LT6 Protection and Intelligence Combined File 9110 CONTENTS Motor Protection ....................................................................................................... 2-3 Functions .................................................................................................................. 4-5 Characteristics .......................................................................................................... 6-9 Tripping Curves .................................................................................................... 10-11 Catalog Numbers .................................................................................................. 12-13 Mounting Dimensions ........................................................................................... 14-15 Application Diagrams ........................................................................................... 16-21 Glossary ...................................................................................................................... 22 This document provided by Barr-Thorp Electric Co., Inc. 800-473-9123 www.barr-thorp.com LT6 Multifunction Protection Relays Motor Protection Operating conditions There are many possible causes of electric motor failure. One of the most common, and which is often accidental, is the utilization of motors beyond the operating limits defined by the manufacturer or in abnormal ambient conditions. A statistical survey covering 9000 incidents of motor failure, gave the following results : Overloads (1) 30 % Operating conditions (example: corrosive atmosphere) 19 % Phase failure 14 % Bearing failure 13 % Aging (example: ambient temperature too high) (1) 10 % Rotor faults 5% Miscellaneous 9% These faults are related to motors with a power rating of 37 kW (50 hp) or more. (1) An examination of the above results shows that, in more than 40 % of cases, the fault is due to the effects of heating. Leaving aside the replacement of wearing parts, such as bearings, slip rings, brushes, etc., the life of an electric motor is linked to that of its insulation. Provided that the temperature rise limit is not exceeded, the life expectancy of insulating materials is extremely long. It is decreased by approximately one half for an excess temperature rise of 10 °C (18 °F). The operating temperature limit TL of an insulating material depends on the type of material and is the sum of the ambient air temperature AT (cooling air), the temperature rise limit TRL and an additional temperature rise value ATR considered necessary because the measurement of winding resistance variation does not determine the temperature of the hottest part of the motor winding, but only gives an average value for temperature rise. The diagram below defines the standardized limits for different classes of insulation. In all cases, the normal ambient cooling air temperature is fixed at 40 °C (104 °F). °F °C 356 180 329 311 165 155 284 140 266 257 248 239 130 125 120 115 212 100 176 80 140 60 104 40 68 20 32 0 ATR TRL TL AT E B F Insulation Classes 2 This document provided by Barr-Thorp Electric Co., Inc. 800-473-9123 www.barr-thorp.com HA LT6 Multifunction Protection Relays Motor Protection The rated power of a motor corresponds to its temperature rise limit for an ambient temperature of 40 °C (104 °F). The temperature rise limits for the different parts of a machine are given in the following table, which is an extract from IEC publication 34-1. Temperature rise limit Insulation class B F H Insulated winding (measurement by resistance) °C/°F 80/176 100/212 125/257 Commutators and slip-rings °C/°F 80/176 90/194 (1) 100/212 (1) Bearings °C/°F 60/140 60/140 (2) 60/140 (2) When a motor is used at an ambient air temperature other than the normal value, its temperature rise limit should be modified in order to maintain the same maximum temperature limit. The result is that the motor operational power is no longer the same as its rated power. Also, the altitude of the installation, if this is above 1000 m (3281 ft), affects the cooling and increases the temperature rise. The following table gives the ratio between operational power and rated power, according to the operating conditions, for a given ambient temperature. It corresponds to insulation class B. Operational power / Rated power in watts Altitude m ft Ambient air temperature (AT) 30 °C 35 °C 40 °C (86 °F) (95 °F) (104 °F) 1000 3281 1.07 1.04 1.00 0.96 0.92 0.87 0.82 1500 4922 1.04 1.01 0.97 0.93 0.89 0.84 0.79 2000 6562 1.01 0.98 0.94 0.90 0.86 0.82 0.77 2500 8203 0.97 0.95 0.91 0.87 0.84 0.79 0.75 3000 9843 0.93 0.91 0.87 0.84 0.80 0.76 0.71 3500 11,484 0.89 0.86 0.83 0.80 0.76 0.72 0.68 4000 13,124 0.83 0.81 0.78 0.75 0.72 0.68 0.64 45 °C 50 °C (113 °F) (122 °F) 55 °C (131 °F) 60 °C (140 °F) The values shown in the above table are for guidance only. In effect, the derating of a motor depends on its size, insulation class, method of construction (self-ventilated or forced ventilation, enclosure type), and varies according to the manufacturer. Also, in addition to the normal ambient conditions, the rated power of a motor is defined by the manufacturer for continuous duty S1. This covers continuous operation of sufficient duration to enable the motor to reach a steady temperature. It is this value of rated power that is normally shown on the motor plate. There are other standardized types of duty, such as temporary duty S2, or intermittent periodic duty type S3, S4 and S5, for which the motor manufacturer defines an operational power appropriate to each and different from the rated power. (1) For temperature rise limits of 90 °C (194 °F) and 100 °C (212 °F) the brushes must be selected with the agreement of the motor manufacturer. (2) These limit values may be exceeded depending on the quality of the grease used and the applied loads. 3 This document provided by Barr-Thorp Electric Co., Inc. 800-473-9123 www.barr-thorp.com LT6 Multifunction Protection Relays Functions The LT6 is designed for the control, monitoring, and protection of AC motors. Product functions not using serial link communication The LT6 protects against - thermal overloads by monitoring motor currents: up to 25 full load amps with internal current transformers; greater than 25 full load amps with external current transformers, - overheating of motors with embedded PTC thermistor probes, - phase unbalance and phase loss, - earth (ground) fault. It provides - control of up to two power contactors for non-reversing, reversing, two-speed, and star-delta motor starting, - fault signalling via an internal output relay and a 7-segment LED display. LT6-P0M005FM Using serial link communication The LT6 may be set to protect against - thermal overloads by monitoring motor currents: up to 25 full load amps with internal current transformers; greater than 25 full load amps with external current transformers, - overheating of motors with embedded PTC thermistor probes, - phase unbalance and phase loss, - earth (ground) fault, - underload, - prolonged starting time, - overtorque and locked rotor, - phase reversal, - low power factor. It provides - control of one or two power contactors for non-reversing, reversing, two-speed, and star-delta motor starting, - fault signalling via an output relay and a 7-segment LED display, - voltage limitation by monitoring voltage between phases, - signalling in the event of exceeding the short-circuit current, - thermal alarm, Bus communication - provides information exchange between the LT6 and PLC or personal computer: - instantaneous values (voltage, current per phase, frequency, power factor, thermal state of motor stator and copper windings), - data log of 5 previous trip incidents (causes and remedies), - maintenance statistics, cause of trip statistics, - operating and alarm states. Physical features • • • • • • • • • • • • Power input terminals from the contactor and power output terminals to the motor. 16-pin plug-in connector for monitoring protection inputs. 11-pin plug-in connector for outputs for contactor coil, thermal alarm, and fault signalling. 5-pin plug-in connector for ground fault current transformer and PTC thermistor probes. Two rotary dials for selection of motor full load current from 20% to 109% of the maximum rated current (1 A, 5 A, or 25 A) of the LT6 relay. Rotary dial for selection of Class 5 (10 A), 10, 15, 20, 25, or 30 thermal overload protection. DIP switch for selection of: Bus communication address UNI-TELWAY™ or JBUS/MODBUS® protocol Manual or automatic thermal overload reset Enable local (front face) or line (serial communication link) thermal overload settings Sealable transparent cover eliminates tampering with local front cover settings. 7-segment display for fault indication. "Test" button (opens N/C overload trip contact and closes N/O fault signal contact). Manual "Reset" button. SUB-D Serial interface port for bus communication. For use with personal computer running Microsoft Windows 3.1 or Windows 95 with Configuration Software Kit LA9P620 (includes RS232 cable and software) For use with PLC or MAGELIS™ XBT terminal with XBT-L100 programming software 4 This document provided by Barr-Thorp Electric Co., Inc. 800-473-9123 www.barr-thorp.com LT6 Multifunction Protection Relays Functions LT6 configuration table Functions Protection Parameters preset and function enabled at factory Ability to enable or disable by serial link Thermal overload YES Parameters Description Factory settings Ir (% rating) Overload class Overload alarm 20 % 5 100 % Factory installed 1 kΩ resistor to disable function Adjustment range accessible via serial link communication 20 to 109 % (1) 5,10,15,20,25,30 (1) 0 to 100 % Overheating via PTC thermistors YES — Enable or disable Phase unbalance and phase failure YES Id (% I rms average (2)) 30 % I average Start inhibit 0.7 sec. Time before 5 sec. tripping 10 to 30 % 0 to 10 sec. 0 to 10 sec. Earth (ground) fault YES YES I∆r Time before tripping 30 A 5 sec. 0.3 to 30 A 0 to 5 sec. Prolonged starting time YES ISD (% Ir) Starting time 150 % Ir 10 sec. 100 to 500 % Ir 0 to 30 sec. Undercurrent YES IV (% Ir) Time before tripping 30 % Ir 10 sec. 30 to 90 % Ir 0 to 30 sec. Torque limitation YES ILC (% Ir) Time before tripping 200 % Ir 10 sec. 150 to 800 % Ir 0 to 30 sec. Cos ϕ (power factor) YES Cos ϕ Time before tripping 0.1 10 sec. -1 to 1 0 to 10 sec. Phase rotation YES — Disabled Enable or disable direction monitoring (1) These values can be activated and adjusted from the front face of the relay when set to “Local adjust”. (2) The average rms current is equal to the average current value of the 3 phases. Complementary functions Parameters preset and function enabled at factory Voltage threshold detection (3) Thermal overload reset time is based on calculated cooling time. Cooling time of a self-cooled motor at standstill is four times longer than the cooling time of an external-cooled motor. Ability to enable or disable by serial link YES Description Factory setting Adjustment range accessible via serial link communication Trip voltage Time before tripping Reset voltage Time before resetting 70 % Un 10,000 sec. 68 to 120 % Un 0 to 100,000 sec. 90 % Un 10,000 sec. 68 to 120 % Un 0 to 100,000 sec. Short-circuit detection YES Isc 15 x lr peak – Automatic reset YES Time before reset Iron θ °C before reset 0 sec. 100 % θn 0 to 1000 sec. 0 to 100 % θn Motor control YES Control of outputs A and B Reversing Reversing Independent 2-stage Motor cooling YES Cooling method for motor Self-cooled (3) Self-cooled or external-cooled (3) 5 This document provided by Barr-Thorp Electric Co., Inc. 800-473-9123 www.barr-thorp.com LT6 Multifunction Protection Relays Characteristics Environment Conforming to standards IEC 947-4-1, IEC 34-11, IEC 755, VDE 0106, VDE 0660 European community directives marking Meets the essential requirements of Low Voltage equipment (LV) & Electromagnetic Compatibility (EMC). Approvals UL 508, CSA, PTB Protective treatment “TH” (Tropical Finish) Degree of protection Conforming to IEC 947-1 IP 20 (1) Pollution degree Conforming to IEC 664 3 Shock resistance Conforming to IEC 68-2-27 15 gn, 11 milliseconds Vibration resistance Conforming to IEC 68-2-6 2 gn (3 to 100 Hz) Ambient air temperature around the device Storage °C °F - 35 to + 85 - 31 to + 185 Operation °C - 20 to + 70 - 4 to + 158 Flame resistance °F Conforming to UL 94 Maximum operating altitude m ft 2000 6562 In relation to normal vertical mounting plane 4.65 in. 118 mm Operating position V0 3.55 in. 90 mm Resistance to electrostatic discharge Conforming to IEC 1000-4-2 level 3 kV 8 Resistance to electromagnetic interference Conforming to IEC 1000-4-3 level 3 V/m 10 Resistance to fast transient currents Conforming to IEC 1000-4-4 level 4 kV 2 Resistance to conducted radio-frequency disturbances Rated undissipated pulse withstand (U imp) 5.15 in. 131 mm Conforming to IEC 1000-4-6 level 3 Conforming to IEC 947-1 kV 6 Rated dissipated pulse withstand Conforming to IEC 1000-4-5 level 3 Resistance to low frequency disturbances - supply harmonics Conforming to IEC 947-2 Appendix F Clause F4.1 Resistance to micro-breaks Conforming to IEC 1000-4-11 (1) Only applicable when power cabling to relay exceeds the following sizes: 1.5 mm2 (16 AWG) fitted with cable end or 2.5 mm2 (14 AWG) not fitted with cable end. 6 This document provided by Barr-Thorp Electric Co., Inc. 800-473-9123 www.barr-thorp.com LT6 Multifunction Protection Relays Characteristics Power circuit characteristics—terminals L11, L21, L31, L15, L25, L35, 2T1, 4T2, 6T3 Relay type LT6-P0M005FM LT6-P0M025FM V 110 to 600 VAC 110 to 600 VAC V 690 VAC 690 VAC Operating frequency Hz 50/60 (1) 50/60 (1) Rated operational current A 0.2 to 5 (2) 5 to 25 1 or 2 conductors mm2 AWG 1.5 to 6 16 to 10 Stranded cable w/out cable end 1 or 2 conductors mm2 AWG 1.5 to 6 16 to 10 Stranded cable with cable end mm2 AWG 1.5 to 4 16 to 12 N.m lb-in 1.7 15 Operating voltage range Rated insulation voltage (Ui) Conforming to IEC 947-1 Cabling Solid cable 1 or 2 conductors Terminal tightening torque Short-circuit protection By circuit breaker ≤1A 1 to 5 A >5A By fuses Select in accordance with National Electrical Code Select in accordance with National Electrical Code RK5 - 4 Amp. max. RK5 - 20 Amp. max. Max. 400 % of motor FLA Max. 400 % of motor FLA Control circuit supply characteristics—terminals A1, A2 Rated insulation voltage (Ui) Conforming to IEC 947-1 V 380 VAC V 90 to 276 VDC 90 to 276 VDC - 50/60 Hz 1 or 2 conductors mm2 AWG 0.5 to 1 20 to 18 Stranded cable w/out cable end 1 or 2 conductors mm2 AWG 0.5 to 1 20 to 18 Stranded cable with cable end 1 conductor mm2 AWG 0.5 to 1 20 to 18 2 conductors mm2 AWG 0.5 to 0.75 20 N.m lb-in 0.7 6.5 Operating voltage Cabling Plug-in connector Solid cable Terminal tightening torque Discrete input characteristics—terminals I1, I2, I3, I4, I5, I6, I7, I8, C1, C2 (see "Control circuit supply characteristics" for cabling and tightening torques) Rated insulation voltage (Ui) Operating voltage Current consumption Input impedance Conforming to IEC 947-1 Minimum transient value V V mA kΩ 250 VAC 90 to 15 VDC; 90 to 276 VAC - 50/60 Hz ≥ 1 (changing from 0 state to 1 state in t ≥ 4 ms) 56 (1) For use with 110 to 690 V - 50/60 Hz AC motors only. Not approved for use with DC motors or variable speed drives. (2) For motor full load currents > 25 A, use LT6P0M005FM with customer-provided external current transformers with 1 A or 5 A secondary outputs. 7 This document provided by Barr-Thorp Electric Co., Inc. 800-473-9123 www.barr-thorp.com LT6 Multifunction Protection Relays Characteristics Discrete output characteristics—terminals 95, 96, 01, 02 (see "Control circuit supply characteristics" for cabling and tightening torques) Rated insulation voltage (Ui) Conforming to IEC 947-1 Type of output Relay Associated fuse protection Conforming to IEC 947-5 V 380 VAC 1 N/O per channel A 6 A max. type RK5 Rated voltage V 250 VAC Permissible power for category AC-15 Associated with contactor VA 500 (Ie = 0.5 A, Ue = 250 VAC, Ith = 5 A, cos ϕ = 0.4, for 100,000 operations) LC1-K, LC2-K, LC7-K, LC8-K LC1-D09 to D95, LC1-F115 to F150 Rated voltage V 30 VDC Permissible power for category DC-15 Associated with contactor VA 50 (Ie = 0.5 A, Ue = 30 VDC, Ith = 5 A, L/R ≤ 25 ms for 100,000 operations) LP1-K, LP2-K, LP1-D09 and D12 LP1-D18 to D32 (with LA4-DC1U or DC2U) LP1-D40 to D80 (with LA4-DC3U) AC loads DC loads Signalling output characteristics—terminals 97, 98, 93, 94 (see "Control circuit supply characteristics" for cabling and tightening torques) Rated insulation voltage (Ui) Conforming to IEC 947-1 V 380 VAC Type of output Relay Associated fuse protection Conforming to IEC 947-5 A 4 A max. Type RK5 Current limit At U = 5 VDC mA 10 Rated voltage V 250 VAC Permissible power for category AC-15 Associated with contactor W 250 (Ie = 0.2 A, Ue = 250 VAC, Ith = 2 A, 300,000 operations for resistive load) LC1-K, LC2-K, LC7-K, LC8-K with suppressor block LA4-KE Rated voltage V Permissible power for category DC-15 Associated with contactor W 1 N/O per channel AC loads DC loads 30 VDC 50 (Ie = 0.2 A, Ue = 30 VDC, Ith = 2 A, 300,000 operations for resistive load) LP1-K, LP2-K with suppressor block LA4-KC External current transformer characteristics (Customer provided. Must have 1 A or 5 A secondary Conforming to standards IEC 185, IEC 71 Accuracy class 5P Accuracy limit factor 15 output) 8 This document provided by Barr-Thorp Electric Co., Inc. 800-473-9123 www.barr-thorp.com LT6 Multifunction Protection Relays Characteristics PTC thermistor probes DA1-TT••• Probe characteristics—terminals T1, T2 (see "Control circuit supply characteristics" for cabling and tightening torques) Conforming to standards IEC 34-11, mark A Resistance At 25 °C Ω 3 x 250 in series Rated operational voltage (Ue) Per probe V 2.5 VDC max. kV 2.5 Rated insulation voltage (Ui) Insulation Between probes mm in 250 10 Between probe and motor terminal block m ft 1 3 Guaranteed operating zones : examples with 3 probes type DA1-TT••• (250 Ω at 25 °C) connected in series, conforming to IEC 34-11, mark A. Resistance (ohms) 10 000 4000 Trip zone 1650 1500 1000 750 Reset zone 1 1 3 probes type DA1-TT••• (250 Ω at 25 °C) in series 100 NOT : nominal operating temperature 20 Trip zone on short-circuit probes 10 Trip control device -20 0 NOT - 5 °C NOT NOT + 5 °C NOT + 15 °C Reset control device NOT - 20 °C Cable lengths Reinforced Temperature (°C) 9 This document provided by Barr-Thorp Electric Co., Inc. 800-473-9123 www.barr-thorp.com LT6 Multifunction Protection Relays Tripping Curves Cold state curves (1) t (s) 10000 1000 100 Class 30 Class 25 Class 20 10 Class 15 Class 10 Class 5 (10 A) I/Ir 1 1 1.12 1.5 2 3 4 5 6 7 8 (1) Tripping time accuracy : ± 8 % to 7.2 x I/Ir. 10 This document provided by Barr-Thorp Electric Co., Inc. 800-473-9123 www.barr-thorp.com LT6 Multifunction Protection Relays Tripping Curves Hot state curves (1) t (s) 10000 1000 100 10 Class 30 Class 25 Class 20 Class 15 Class 10 Class 5 (10 A) I/Ir 1 1 1.12 1.5 2 3 4 5 6 7 8 (1) Tripping time accuracy : ± 8 % to 7.2 x I/Ir. 11 This document provided by Barr-Thorp Electric Co., Inc. 800-473-9123 www.barr-thorp.com LT6 Multifunction Protection Relays Catalog Numbers 3-pole multifunction protection relays Operational current A Catalog Number 0.2 to 1 (use terminals L11-L21-L31) LT6-P0M005FM 1 to 5 (use terminals L15-L25-L35) LT6-P0M005FM 5 to 25 LT6-P0M025FM LT6-P0M005FM For AC motor full load currents > 25 A, use LT6P0M005FM with customer provided external current transformers with 1 A or 5 A secondary outputs. Configuration software and user's manual Description For use with Catalog Number Configuration software kit: - 3"1/2 diskette, - 2 meter RS232 cable All ratings of relay PC minimum requirements: 386 SX with Windows 3.1 LA9-P620 User's manual — USA Edition 9110IM9701 Earth fault toroids (ground fault current transformers) Products marketed under the Merlin Gerin brandname. For ordering references, please refer to our Merlin Gerin “Low voltage distribution 95/96” catalog, pages D72 to D74 Sensitivity Internal Ø Type Catalog Number of toroid mm 0.3 to 30 A 30 TA30 50437 50 PA50 50438 80 IA80 50439 120 MA120 50440 200 SA200 50441 300 GA300 50442 46 POA 50485 110 GOA 50486 Note: Merlin Gerin earth fault toroids may be substituted with GFCT with 1000:1 ratio. 12 This document provided by Barr-Thorp Electric Co., Inc. 800-473-9123 www.barr-thorp.com LT6 Multifunction Protection Relays Catalog Numbers PTC thermistor probes DA1-TT••• Description Nominal operating temperature (NOT) °C Sold in lots of Catalog Number Triple probes 90 10 DA1-TT090 110 10 DA1-TT110 120 10 DA1-TT120 130 10 DA1-TT130 140 10 DA1-TT140 150 10 DA1-TT150 160 10 DA1-TT160 170 10 DA1-TT170 13 This document provided by Barr-Thorp Electric Co., Inc. 800-473-9123 www.barr-thorp.com LT6 Multifunction Protection Relays Mounting Dimensions Protection relays LT6-P LT6-P0M•••FM on 35 mm " DIN rail 4.33 in. 110 mm 4.65 in. 118 mm Drilling pattern for panel mounting with M4 or ANSI #8 machine screws 5.15 in. 131 mm 3.55 in. 90 mm 2.12 in. 54 mm AF1EA4 Clip For M4 screws on pre-slotted mounting plate AM1-PA LT6-P0M•••FM weight: 1.03 kg (2.3 lbs). Earth fault toroids TA30, PA50 IA80, MA120, SA200 Ø5 c2 21 b1 H Øb b2 b H K b1 4 16 8 2xØ4.5 2xØ4.5 Øc 29 c1 Type TA30 PA50 Dimensions in millimeters b b1 Øc 83 53 30 109 66 50 c1 60 87 c2 31 45 H 50 60 Type IA80 MA120 SA200 Øc a J G c1 a1 Dimensions in millimeters a a1 Øb b1 b2 26.5 44 122 80 55 26.5 44 164 80 55 29 46 256 120 90 Øc 80 120 196 c1 150 190 274 14 This document provided by Barr-Thorp Electric Co., Inc. 800-473-9123 www.barr-thorp.com G 35 35 37 H 65 65 104 J 126 166 254 K 40 40 60 LT6 Multifunction Protection Relays Mounting Dimensions 13.54 in. 344 mm GA300 11.77 in. 299 mm 1.14 in. 29 mm Øb POA, GOA Øc a 4xØ5 G Type POA GOA Dimensions in millimeters a Øb 72 148 78 224 Øc 46 110 G 57 76 15 This document provided by Barr-Thorp Electric Co., Inc. 800-473-9123 www.barr-thorp.com LT6 Multifunction Protection Relays Application Diagrams Motor control: full-voltage non-reversing starting (channels A and B set for reversing or independent control) Control from front face of relay Control via discrete inputs of relay – KM1 Reserved I8 Discrete input E I7 Discrete input D – KM1 Motor stop Channel B Discrete input C I5 Stop channels A and B I4 Start channel B I3 Start channel A I2 Local or serial communication control of A and B I1 Reset O2 97 Fault signalling 98 Motor start 93 Alarm Control supply (1) A2 A1 I8 Discrete input E I7 Discrete input D I6 Discrete input C I5 Stop channels A and B I4 Start channel B I3 Start channel A I2 Local or serial communication control of A and B I1 Reset O1 Channel B O2 97 Fault signalling 98 93 Alarm C1 Common 1 (-) 1 kΩ C2 Common 2 (-) PTC probes T1 T2 NC Earth fault H1 toroid H2 Control supply (1) A2 A1 1 kΩ PTC probes T1 T2 NC H1 Earth fault toroid H2 (2) – KM1 (2) – KM1 1L1 1L1-L11-L15 2T1 3L2 3L2-L21-L25 4T2 5L3 5L3-L31-L35 6T3 M 3 1L1 1L1-L11-L15 2T1 3L2 3L2-L21-L25 4T2 5L3 5L3-L31-L35 6T3 Control via serial link communication (UNI-TELWAY, Jbus/Modbus) Maintained stop (3) D1 D2 D3 D4 95 Channel A Reserved I8 Discrete input E I7 Discrete input D I6 Discrete input C I5 Stop channels A and B I4 Start channel B I3 Start channel A I2 Local or serial communication control of A and B I1 Reset – KM1 96 O1 Channel B O2 97 Fault signalling 98 93 Alarm 94 C1 Common 1 (-) C2 Common 2 (-) Control supply (1) – KM1 96 94 94 C1 Common 1 (-) C2 Common 2 (-) Channel A Reserved 96 O1 I6 95 D1 D2 D3 D4 D1 D2 D3 D4 95 Channel A Motor stop Motor start A2 A1 1 kΩ PTC probes T1 T2 NC Earth fault H1 toroid H2 (2) – KM1 1L1 1L1-L11-L15 2T1 3L2 3L2-L21-L25 4T2 5L3 5L3-L31-L35 6T3 M 3 (1) For DC control supplies inputs I1 to I8 must be connected to the positive line. (2) Disconnecting means and short circuit protection must comply with National Electrical Code and local codes. (3) Local maintained stop must be connected when serial link is used without local stop push button. 16 This document provided by Barr-Thorp Electric Co., Inc. 800-473-9123 www.barr-thorp.com M 3 LT6 Multifunction Protection Relays Application Diagrams Motor control: full-voltage non-reversing starting Control via serial link communication with signalling, earth fault toroid, PTC probes, state of power components Channels A and B set for reversing or independent control Possible to control the motor via discrete input (“local” position) or by serial link communication Maintained stop (3) D1 D2 D3 D4 95 Channel A Reserved – Q1 – KM1 I8 Discrete input E I7 Discrete input D I6 Discrete input C I5 Stop channels A and B I4 Start channel B I3 Start channel A I2 Local or serial communication control of A and B I1 Reset O1 Channel B O2 Motor stop Motor start Line – KM1 96 97 Fault signalling 98 Tripped 93 Alarm Overload 94 Local C1 Common 1 (-) C2 Common 2 (-) A2 Control supply (1) A1 PTC probes T1 T2 NC Earth fault H1 toroid H2 (2) – KM1 1L1 1L1-L11-L15 2T1 3L2 3L2-L21-L25 4T2 5L3-L31-L35 5L3 6T3 U V M 3 θ°C W Power terminal connections for single-phase motor applications A2 A1 (2) – KM1 1L1-L11-L15 2T1 3L2-L21-L25 4T2 5L3-L31-L35 6T3 M (1) For DC control supplies the inputs I1 to I8 must be connected to the positive line. (2) Disconnecting means and short circuit protection must comply with the National Electrical Code and local codes. (3) Local maintained stop must be connected when serial link is used without local stop push button. 17 This document provided by Barr-Thorp Electric Co., Inc. 800-473-9123 www.barr-thorp.com LT6 Multifunction Protection Relays Application Diagrams Motor control: full-voltage reversing starting Control via discrete inputs of relay Channels A and B set for reversing control 95 D1 D2 D3 D4 Control via front face of relay Channels A and B set for reversing control D1 D2 D3 D4 95 Channel A Reserved I8 Discrete input E I7 Discrete input D I6 Discrete input C Stop channels A and B I4 Start channel B Start channel A Discrete input E I7 Discrete input D I6 Discrete input C I5 Stop channels A and B Reverse start I4 Start channel B Forward start I3 Start channel A I2 Local or serial communication control of A and B 93 I1 Reset 94 C1 Common 1 (-) Forward start – KM1 Fault signalling I2 Local or serial communication control of A and B I1 Reset Reverse start Motor stop – KM1 97 – KM1 – KM2 98 A2 A1 C2 Common 2 (-) 1 kΩ PTC probes T1 T2 NC Earth fault H1 toroid H2 A2 Control supply (1) A1 Fault signalling – KM1 – KM2 O2 97 98 93 Alarm 94 1 kΩ PTC probes T1 T2 NC Earth fault H1 toroid H2 (2) (2) – KM1 – KM1 1L1 L11 1L1-L11-L15 2T1 3L2 L21 3L2-L21-L25 4T2 M 1L1 L11 1L1-L11-L15 2T1 3L2 L21 3L2-L21-L25 4T2 5L3 L31 5L3-L31-L35 6T3 3 6T3 L31 5L3-L31-L35 – KM2 – KM2 Control via serial link communication Channels A and B set for independent control Maintained stop (3) D1 D2 D3 D4 95 Channel A Reserved I8 Discrete input E I7 Discrete input D I6 Discrete input C I5 Stop channels A and B I4 Start channel B Start channel A I2 Local or serial communication control of A and B I1 Reset C2 Common 2 (-) A2 A1 – KM2 – KM1 96 O1 Channel B I3 C1 Common 1 (-) Control supply (1) – KM2 – KM1 96 O1 Channel B Alarm C2 Common 2 (-) 5L3 – KM2 O2 – KM2 C1 Common 1 (-) Control supply (1) I8 O1 I5 I3 96 Motor stop Channel B Channel A Reserved Fault signalling – KM1 – KM2 O2 97 98 93 Alarm 94 1 kΩ PTC probes T1 T2 NC Earth fault H1 toroid H2 (2) – KM1 1L1 L11 1L1-L11-L15 2T1 3L2 L21 3L2-L21-L25 4T2 5L3 L31 5L3-L31-L35 6T3 M 3 – KM2 (1) For DC control supplies the inputs I1 to I8 must be connected to the positive line. (2) Disconnecting means and short circuit protection must comply with National Electrical Code and local codes. (3) Local maintained stop must be connected when serial link is used without local stop push button. 18 This document provided by Barr-Thorp Electric Co., Inc. 800-473-9123 www.barr-thorp.com M 3 LT6 Multifunction Protection Relays Application Diagrams Motor control: full-voltage reversing starting with measurement of cos ϕ and voltage Control via serial link communication Channels A and B set for reversing control Maintained stop (3) D1 D2 D3 D4 95 Channel A Reserved 230 V 0V – KM2 – KM1 – KM1 – KM2 96 C2 Common 2 (–) I8 Discrete input E I7 Discrete input D I6 Discrete input C I5 Stop channels A and B I4 Start channel B O1 Channel B O2 97 Fault Start channel A signalling Local or serial com98 I2 munication control of A & B Reset I1 93 C1 Common 1 (–) Alarm 94 A2 I3 Control supply (1) A1 230 V 0V (2) 1L1 3L2 5L3 1 kΩ PTC probes T1 T2 NC Earth fault H1 toroid H2 – KM1 L11 1L1-L11-L15 2T1 L21 3L2-L21-L25 4T2 5L3-L31-L35 L31 6T3 M 3 (1) For DC control supplies the inputs I1 to I7 must be connected to the positive line. (2) Disconnecting means and short circuit protection must comply with National Electrical Code and local codes. (3) Local maintained stop must be connected when serial link is used without local stop push button. 19 This document provided by Barr-Thorp Electric Co., Inc. 800-473-9123 www.barr-thorp.com LT6 Multifunction Protection Relays Application Diagrams Motor control: star-delta starting (channels A and B set for 2-stage control) Control via discrete inputs of relay D1 D2 D3 D4 95 Channel A Reserved Motor stop Motor start I8 Discrete input E I7 Discrete input D – KM3 – KM1 – KM2 I6 Discrete input C Stop channels A & B I4 Start channel B I3 Start channel A Local or serial communi97 Fault cation control of A & B signalling Reset 98 I1 – KM3 O1 I5 I2 – KM1 96 Channel B – KM1 – KM3 O2 C1 Common 1 (–) 93 C2 Common 2 (–) Control supply (1) Alarm A2 94 A1 (2) 1L1 2T1 L11 1L1-L11-L15 3L2 4T2 L21 3L2-L21-L25 5L3 1 – KM1 2 1 kΩ PTC probes T1 T2 NC Earth fault H1 toroid H2 4 5 6 1 – KM2 2 U1 3 4 V1 6 W1 5 6T3 L31 5L3-L31-L35 3 U2 M 3 V2 W2 1 – KM3 2 3 4 5 6 Control via serial link communication Maintained stop (3) D1 D2 D3 D4 95 Channel A Reserved I8 Discrete input E I7 Discrete input D – KM3 – KM1 – KM2 I6 Discrete input C Stop channels A & B I4 Start channel B I3 Start channel A Local or serial communi97 Fault cation control of A & B signalling Reset 98 I1 – KM3 O1 I5 I2 – KM1 96 Channel B – KM1 – KM3 O2 C1 Common 1 (–) C2 Common 2 (–) Control supply (1) A2 3L2 5L3 94 A1 1 kΩ PTC probes T1 T2 NC Earth fault H1 toroid H2 (2) 1L1 93 Alarm L11 1L1-L11-L15 L21 3L2-L21-L25 L31 5L3-L31-L35 2T1 4T2 6T3 1 – KM1 2 3 4 5 6 1 – KM2 2 U1 3 4 V1 5 6 W1 U2 M V2 3 W2 1 – KM3 2 3 4 5 6 (1) For DC control supplies the inputs I1 to I7 must be connected to the positive line. (2) Disconnecting means and short circuit protection must comply with National Electrical Code and local codes. (3) Local maintained stop must be connected when serial link is used without local stop push button. 20 This document provided by Barr-Thorp Electric Co., Inc. 800-473-9123 www.barr-thorp.com LT6 Multifunction Protection Relays Application Diagrams Motor control: star-delta starting with adjustable time delay Control via serial link communication Channels A and B set for 2-stage control Maintained stop (3) D1 D2 D3 D4 95 Channel A Reserved 230 V 0V – KM3 – KM1 – KM3 96 C2 Common 2 (–) I8 – KM1 Discrete input E I7 Discrete input D I6 Discrete input C O1 Channel B I5 Stop channels A and B I4 Start channel B – KM3 – KM2 – KM1 O2 97 Fault Start channel A signalling 98 I2 Local or serial communication control of A & B I1 Reset 93 C1 Common 1 (–) Alarm 94 A2 I3 Control supply (1) 230 V A1 400 V 0V 0V 1 kΩ PTC probes T1 T2 NC Earth fault H1 toroid H2 (2) 1L1 L11 1L1-L11-L15 2T1 3L2 L21 3L2-L21-L25 4T2 5L3 5L3-L31-L35 L31 6T3 1 – KM1 2 3 4 5 6 1 – KM2 2 U1 3 V1 4 U2 M V2 3 5 6 W1 W2 1 – KM3 2 3 4 5 6 (1) For DC control supplies the inputs I1 to I7 must be connected to the positive line. (2) Disconnecting means and short circuit protection must comply with National Electrical Code and local codes. (3) Local maintained stop must be connected when serial link is used without local stop push button. 21 This document provided by Barr-Thorp Electric Co., Inc. 800-473-9123 www.barr-thorp.com LT6 Multifunction Protection Relays Glossary Glossary PTC Positive Temperature Coefficient. A thermistor resistor with a resistance value which increases with temperature and which increases very rapidly as the nominal operating temperature is reached. RDF Residual Differential Fault (earth leakage or ground fault) rms Root mean square value of a signal I Line current Ir Motor full load current Id Phase imbalance current (calculated value) I∆ Residual differential fault current (earth leakage current) I∆r Set value of the residual differential fault current (earth leakage current) Iv Monitoring value of the underload current, a multiple of Ir Imax The highest value of the three phase currents Imini The lowest value of the three phase currents Iav Average value of the three phase currents Isd Monitoring threshold of the starting current, a multiple of Ir ILC Torque limitation (locked rotor) current ICC Short-circuit current Discrete On/Off Θn Nominal temperature of the iron circuit reached with I = Ir after an infinite time Θr Set temperature for the thermal overload alarm Cos ϕ Power factor Earth fault Ground fault Earth fault toroid Ground fault sensor (zero sequence current transformer) Un Nominal voltage 22 This document provided by Barr-Thorp Electric Co., Inc. 800-473-9123 www.barr-thorp.com LT6 Multifunction Protection Relays Notes 23 This document provided by Barr-Thorp Electric Co., Inc. 800-473-9123 www.barr-thorp.com . Square D and are registered trademarks of Square D Company. MAGELIS™ is a trademark of Schneider Electric SA Square D Company P.O. Box 27446 Raleigh, N.C. 27611, USA (919) 266-3671 MODBUS® is a registered trademark of AEG Schneider Automation Inc. Catalog 9110CT9702 07/97 © 1997 Square D All Rights Reserved. This document provided by Barr-Thorp Electric Co., Inc. 800-473-9123 www.barr-thorp.com